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+- The :tacn:`assert_succeeds` and :tacn:`assert_fails` tactics now
+ only run their tactic argument once, even if it has multiple
+ successes. This prevents blow-up and looping from using
+ multisuccess tactics with :tacn:`assert_succeeds`. (`#10966
+ <https://github.com/coq/coq/pull/10966>`_ fixes `#10965
+ <https://github.com/coq/coq/issues/10965>`_, by Jason Gross).